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以湖北通山云母型含钒石煤为原料,对比研究草酸直接浸出和硫酸直接浸出工艺,在Ca F2用量为原矿质量5%(质量分数)的条件下,考查了H+用量、浸出时间、浸出温度和水矿比对钒和铁浸出率的影响。研究表明:在浸出条件均为H+用量12 mol·kg-1、浸出时间6 h、浸出温度95℃、水矿比1.5∶1.0(L·kg-1)条件下,草酸浸出和硫酸浸出过程中钒的浸出率分别为71.5%和74.1%,而铁的浸出率分别为3.4%和13.0%,草酸浸出铁的量仅为硫酸浸出铁的量的26.2%,实现了石煤中钒的选择性浸出。由X射线衍射(XRD)及红外光谱(FTIR)分析可知,两种浸出渣中云母的衍射峰及特征吸收峰均发生明显变化,说明云母晶格结构被破坏,使钒被浸出;对比原矿中黄铁矿的衍射峰,草酸浸出渣黄铁矿衍射峰变化不大,而硫酸浸出渣黄铁矿衍射峰强度减弱,说明硫酸浸出下黄铁矿的溶出量大于草酸浸出体系下的溶出量,与实验结果相一致。
Based on the mica vanadium-containing stone coal from Tongshan in Hubei Province, the direct extraction of oxalic acid and the direct leaching process of sulfuric acid were studied. Under the condition of Ca F2 content of 5% (mass fraction) of ore, the effects of H + dosage, leaching time, Effect of Temperature and Ratio of Mineral to Mineral on Leaching Rate of Vanadium and Iron. The results showed that under the condition of leaching conditions of 12 mol · kg-1 of H +, leaching time of 6 h, leaching temperature of 95 ℃ and water-to-mineral ratio of 1.5:1.0 (L · kg -1), oxalic acid leaching and sulfuric acid leaching The leaching rates of vanadium were 71.5% and 74.1% respectively, while the leaching rates of iron were 3.4% and 13.0% respectively. The amount of oxalic acid leaching iron was only 26.2% of that of sulfuric acid leaching, which achieved the selectivity of vanadium in stone coal Leaching. The X-ray diffraction (XRD) and infrared spectroscopy (FTIR) analysis showed that the diffraction peak and the characteristic absorption peak of mica in both leaching residues changed obviously, which indicated that vanadium lattice structure was destroyed and vanadium was leached out. The diffraction peaks of pyrite and oxalic acid leaching residue pyrite did not change much, but the diffraction intensity of pyrite in sulfuric acid leaching residue was weakened, which indicated that the leaching amount of pyrite under sulfuric acid leaching was greater than that under oxalic acid leaching system, Consistent with the experimental results.